学习笔记：
ladder：梯子
例句：He gave his elbow a wrench when he fell off the ladder.
他从梯子上摔下时扭伤了手肘。
tool：工具
例句：Take up any slack in the tape with a pencil or similar tool before use.
用卡带以前若有松弛状态，请用铅笔之类的工具旋紧。
trash can：垃圾桶
workbench：工作台
car：汽车，轿车
例句：Years ago people had to crank the engine of a car to start it.
多年以前人们必须转动曲柄发动汽车引擎。
